The following suggestions were posted by resource center directors from across the ELCA. They provide you with a host of great books that provide examples of prayers you can use with any age at mealtime.
Enjoy and use them!
Peanut Butter and Jelly Prayers by Julie Sevig, Moorehouse Publishing
One of the things that many families in our synod like are the Meal Prayer cubes from Vibrant Faith. There are 12 (all the same) in a package for $17.95.
Thank You For This Food - Debbie Trafton O'Neal;
Come, Lord Jesus: Devotions For the Home - Susan Briehl;
How the Children Became Stars: A Family Treasury of Stories, Prayers and
Blessings from Around the World, Aaron Zerah - Sorin Books
Bread for the Day: Daily Bible Readings and Prayers 2011 - Dennis
Bushkofsky and Susan Burke